Please note: For the Planetary Micro Mill PULVERISETTE 7 classic line, you require at least 2 grinding bowls of your choice and the corresponding number of grinding balls. The grinding bowl material must also be harder than the material to be ground. In normal cases, grinding bowls and balls of the same material are used. To shorten the grinding time, grinding bowls and balls with a higher density and correspondingly higher impact energy can be used. Please take note of the useful capacity, this is not identical with the bowl volume!
Please select 2 grinding bowls, which are offered in the sizes 45 ml and 12 ml to perfectly match your sample volume. The useful capacity of the grinding bowls can be found in the selection aid.
For the best grinding results in each individual case, all grinding bowls are available in 8 different materials, thus directly preventing contamination of the samples as a result of undesired abrasion.
For the Vario-Planetary Mill PULVERISETTE 4 classic line you require at least 2 grinding bowls of your choice and the corresponding number of grinding balls. The grinding bowl material must also be harder than the material to be ground. In normal cases, grinding bowls and balls of the same material are used. To shorten the grinding time, grinding bowls and balls with a higher density and correspondingly higher impact energy can be used. Please take note of the useful capacity, this is not identical with the bowl volume!
Please select 2 grinding bowls, which are offered in the sizes 500 ml, 250 ml, 80 ml, 45 ml and 12 ml volume, to perfectly match your sample volume. The useful capacity of the grinding bowls can be found in the selection aid.
For the best grinding results in each individual case, all grinding bowls are available in 7 different materials, thus directly preventing contamination of the samples as a result of undesired abrasion.
Grinding bowl with lid and seal ring
Grinding bowl volume: 45 ml
Useful capacity: 3 … 20 ml
Weight net: 0.700 kg
General material specification:
Material: stainless steel - 1.4305
Abrasion resistance: fairly good
Suitable for: medium-hard, brittle samples
Detailed information about the material you will find in the element analysis.
Planetary Micro Mill PULVERISETTE 7 classic line
(Selection Aid)
MATERIAL DATA FOR GRINDING BOWLS / BALLS
| Material | Main component of the material | Density g/cm³ | Abrasion resistance | Used for grinding material |
| Agate | SiO2 | 2.65 | good | soft to medium-hard samples |
| Sintered corundum | Al2O3(99.7 %) | 3.8 | moderately good | medium-hard, fibrous samples |
| Silicon nitride | Si3N4 | 3.25 | extremely good | abrasive samples, metal-free grinding |
| Zirconium oxide | ZrO2 | 5.7 | very good | fibrous, abrasive samples |
| Stainless steel | Fe – Cr - Ni | 7.8 | moderately good | medium-hard, brittle samples |
| Tempered steel | Fe - Cr | 7.9 | good | hard, brittle samples |
| Hardmetal tungsten carbide | WC | 14.95 | very good | hard, abrasive samples |
| Polypropylene | 0.9 | sufficient | for homogenisation |
RECOMMENDED NUMBER OF GRINDING BALLS PER BOWL
Grinding balls ≥ 5 mm
Recommended number of balls per bowl
| Grinding bowl/ Useful capacity (grinding material) |
12 ml 0,5 – 5 ml |
45 ml 3 – 20 ml |
|
| Balls diameter | |||
| 15 mm | 7 | ||
| 10 mm | 6 | 18 | |
| 5 mm | 50 | 180 |
Grinding balls ≤ 3 mm
Recommended ball mass per grinding bowl in grams
| Grinding bowl/ Useful capacity (grinding material) |
12 ml 0.5 - 5 ml |
45 ml 3 - 20 ml |
|
| Material | |||
| Zirconium oxide | 20 g | 70 g | |
| Stainless steel / hardened steel | 30 g | 90 g | |
| Hardmetal tungsten carbide | 50 g | 200 g |
ADDITIONAL INFORMATION
Grinding balls with diameter 3 mm and smaller must be weighed out. The above table provides you with the necessary weight to be included per grinding bowl.
The quantity of grinding balls can be reduced by up to 15%; however, increased wear should be expected in this case. The specified number/mass of balls per bowl is the minimum quantity; depending on the material behaviour, it may be necessary to increase this.
In normal cases, grinding bowls and balls of the same material are used. To shorten the grinding time, grinding bowls and balls with a higher density and correspondingly higher impact energy can be used.
Vario-Planetary Mill PULVERISETTE 4 classic line
(Selection Aid)
MATERIAL DATA FOR GRINDING BOWLS / BALLS
| Material | Main component of the material | Density g/cm³ | Abrasion resistance | Used for grinding material |
| Agate | SiO2 | 2.65 | good | soft to medium-hard samples |
| Sintered corundum | Al2O3 (99.7%) | 3.8 | moderately good | medium-hard, fibrous samples |
| Silicon nitride | Si3N4 | 3.25 | extremely good | abrasive samples, metal-free grinding |
| Zirconium oxide | ZrO2 | 5.7 | very good | fibrous, abrasive samples |
| Stainless steel | Fe – Cr – Ni | 7.8 | moderately good | medium-hard, brittle samples |
| Tempered steel | Fe – Cr | 7.9 | good | hard, brittle samples |
| Hardmetal tungsten carbide | WC | 14.95 | very good | hard, abrasive samples |
RECOMMENDED NUMBER OF BALLS PER GRINDING BOWL
Grinding balls ≥ 5mm
Recommended number of balls per bowl
| Grinding bowl/ Useful capacity (grinding material) |
80 ml 10 – 30 ml |
250 ml 30 – 125 ml |
500 ml 80 – 225 ml |
| Balls diameter | |||
| 40 mm | 4 | ||
| 30 mm | 6 | 8 | |
| 20 mm | 5 | 15 | 25 |
| 15 mm | 10 | 45 | 70 |
| 10 mm | 25 | 50 | 100 |
| 5 mm | 250 | 1200 | 2000 |
Grinding balls ≤ 3 mm
Recommended ball mass per grinding bowl in grams
| Grinding bowl/ Useful capacity (grinding material ) |
80 ml 10 – 30 ml |
250 ml 30 – 125 ml |
500 ml 180 – 225 ml |
| Material | |||
| Zirconium oxide | 100 g | 400 g | 800 g |
| Stainless Steel / hardened steel | 150 g | 500 g | 1100 g |
| Hardmetal tungsten carbide | 300 g | 1000 g | 2100 g |
ADDITIONAL INFORMATION
Grinding balls with diameter 3 mm and smaller must be weighed out. The above table provides you with the necessary weight to be included per grinding bowl.
The quantity of grinding balls can be reduced by up to 15%; however, increased wear should be expected in this case. The specified number/mass of balls per bowl is the minimum quantity; depending on the material behaviour, it may be necessary to increase this.
In normal cases, grinding bowls and balls of the same material are used. To shorten the grinding time, grinding bowls and balls with a higher density and correspondingly higher impact energy can be used.
